A credible answer says: Other sites work, so I would first compare name resolution for the affected hostname and a known-good one. I would record the resolver and exact error, then choose the next check from that result. It does not assert a root cause that has not been tested.

Critical check: The answers remain honest about experience and distinguish proposed tests from completed actions.

Final project: Deliver five response outlines, rehearsal evidence, self-scores and a revision note. Add a follow-up question to each response and explain how new evidence could change your answer.